pitkin



Na Model.)

A. J. PITKIN.

GAR TRUCK.

Patented Sept. 2, 1884.

rl/ /V/ wilnwom Mv PETERS. Phnlwlilhngmgher. Washington. D. c.

NITE TATES ATENT @FFEQE...

CAR-TRUCK.

SPECIFICATION forming part of Letters Patent No. 304,558, datedSeptember 2, 1884.

Application filed May 9, 1884.

To aZZ whom it may concern.-

Be it known that I, ALBERT J OHNSON Prr- KIN, of Schenectady, in thecounty of Schenectady and State of New York, have invented certain newand useful Improvements in Railroad-Oar Trucks, of which the followingis a specification.

The object of my invention is to improve the construction of the body ofthe truck by reducing its weight without impairing its strength; and theinvention consists, primarily, in an improved organization foraccomplishin g this result. My improved trucks thus simplified instructure and organization contain not only less material, and aretherefore much lighter than the ordinary truck, but also can be builtwith greater facility.

I11 the accompanying drawings, Figure 1 is a longitudinal section on theline 1 1 of Fig. 3 through one end or side of a truck-body. Fig. 2 is anend view, partly in section, showing the trusses and thecarrying-wheels. Fig. 3 is a section 011 the line 3 3 of Fig. 1. Fig. 4is a section on the line 4 4 of Fig. 2. detail view showing a somewhatmodified construction of the channel-plate, and Fig. 6 is a detail Viewshowing a modified arrangement of floating bolster.

The arch-bars I) b and the tie-bar 0, which embrace the transom-columnsd d, are of the usual construction. The transom-columns d d are,however, preferably wider than those usually employed, especially attheir lower ends, where they are extended on each side, as indicatedclearly in dotted lines inFig. 1.

The channel plate or iron Bwhich supports the truck-springs and floatingbolster, hereinafter described, is bolted on each side to thetransom-columns (l by bolts h, as clearly illustrated in Figs. 1, 2, and3. This channel-iron is preferably also bolted to a clamp casting orplate, D, by bolts 0, which pass through the bottom of the channel-plateand through the sides or wings of the clamp-casting. This clamp-casting,as clearly illustrated in Fig. 1, is formed with a central socket ordepression which embraces the tiered c and the lower arch-bar, b, andthe lower ends of the transomeolumn bolts also pass through it.

A modification of the structure thus far described is illustrated inFig. 5, inwhich it will Fig. 5 is a (No model.)

be seen that the channel-plate B is composed channel-plate really formeda box which was held at each end between the transom-columns. I11 myimproved structure, however, the sides of the body are entirely open,and the floating bolster plays up and down between the transom-columnson each side of the truck-frame.

The springs O, which carry the truck-bolster A, rest upon thechannel-plate B, as clearly shown in Figs. 2, 3, and 5. Thetruck-bolster, illustrated in Figs. 1 and 2-, is formed by two sidechannel plates orbars connected by a plate, f, on the bottom, and by aplate, m, on, top, and suitably riveted together; or, as shown in Fig.3, the top plate, m, may be dispensed with, as the side channel-plates,a, will be firmly and rigidly held at the top by the kingbolt socket orcenter plate, 0, to which the side plates of the bolster are bolted, asshown at r. I may, however, use a bolster made of a solid beam of wood,as clearly illustrated in Fig. 5. Each end of the bolster is provided oneach sidewith a guideplate, K, bolted to it at Z, which embraces thesides of the transom, so as to prevent end-play of the bolster, asclearly illustrated in Fig. 4. Vith this arrangement any end-thrust ofthe bolster is'of course received by the transom-columns on both sidesof the truck. The bolster is provided with ordinary side bearings, E,for the car-body, and a center plate or king-bolt socket, 0. Theking-bolt passes entirely through the bolster, and is to be provided onthe under side with a suitable key, as usual.

I claim as my invention 1. The combination, substantially as set forth,of the open sided or skeleton truckframe, consisting solely of thetransom-columns and the shallow bottom channel-plate bolted thereto, thebrace-bars, and a floating bolster located between the transom-columns,and guided vertically thereby.

2. The combination, substantially as set forth, of thetransom-c0111inns, the channel- 5. The combination, substantially as setplate, the brace-bars, and the clampcastingD. forth, of a truck-body anda bolster consist- 3. The combination, substantially as set ing of thecombination of side channe1-plates forth, of the channel-plate, thebrace-bars, and and independent top and bottom plates bolted ,1 5 5 theclamp-casting. to the side plates.

at. The combination, substantially as set In testimony whereof I havehereunto subforth, of a truck-body, a bolster consisting of scribed myname.

the combination of side ehannel-plates, an in ALBERT JOHNSON PITKIN.dependent bottom plate bolted to the channel- \Vitnesses: I y 10 plates,and a king-bolt socket or plate bolted 7M. HoWEs SMITH,

to the upper sides of said channel-plates. Gno. S. CLARE.

